/*
 * Copyright (c) JForum Team
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided 
 * that the following conditions are met:
 * 
 * 1) Redistributions of source code must retain the above 
 * copyright notice, this list of conditions and the 
 * following  disclaimer.
 * 2)  Redistributions in binary form must reproduce the 
 * above copyright notice, this list of conditions and 
 * the following disclaimer in the documentation and/or 
 * other materials provided with the distribution.
 * 3) Neither the name of "Rafael Steil" nor 
 * the names of its contributors may be used to endorse 
 * or promote products derived from this software without 
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT 
 * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, 
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 
 * THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES 
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER 
 * IN CONTRACT, STRICT LIABILITY, OR TORT 
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
 * /*
 * Created on Feb 3, 2005 5:15:34 PM
 * The JForum Project
 * http://www.jforum.net
 */
package net.jforum.exceptions;

import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;

import net.jforum.JForumExecutionContext;
import net.jforum.SessionFacade;
import net.jforum.context.RequestContext;
import net.jforum.util.preferences.ConfigKeys;
import net.jforum.util.preferences.SystemGlobals;

import org.apache.log4j.Logger;

import freemarker.template.SimpleHash;
import freemarker.template.Template;

/**
 * @author Rafael Steil
 * @version $Id: ExceptionWriter.java,v 1.14 2007/10/10 04:54:20 rafaelsteil Exp
 *          $
 */
public class ExceptionWriter {
    private static Logger logger = Logger.getLogger(ExceptionWriter.class);

    public void handleExceptionData(Throwable t, Writer w,
	    RequestContext request) {
	StringWriter strWriter = new StringWriter();
	PrintWriter writer = new PrintWriter(strWriter);
	t.printStackTrace(writer);

	String currentUrl = this.extractCurrentUrl(request);

	writer.write(currentUrl);
	writer.close();

	try {
	    logger.error(strWriter);

	    String message = "";
	    Throwable cause = t.getCause();

	    while (cause != null) {
		message = cause.toString();
		cause = cause.getCause();
	    }

	    if (message == null || message.equals("")) {
		message = t.getMessage();
	    }

	    if (message == null || message.equals("")) {
		message = t.toString();
	    }

	    boolean canViewStackTrace = !SystemGlobals
		    .getBoolValue(ConfigKeys.STACKTRACE_MODERATORS_ONLY)
		    || (SessionFacade.isLogged() && SessionFacade
			    .getUserSession().isModerator());

	    String filter = "[<>]";
	    String stackTrace = canViewStackTrace ? strWriter.toString()
		    : "Only moderators can view stack trace.";

	    stackTrace = stackTrace.replaceAll(filter, "");
	    message = message.replaceAll(filter, "");

	    SimpleHash templateContext = JForumExecutionContext
		    .getTemplateContext();

	    templateContext.put("stackTrace", stackTrace);
	    templateContext.put("message", message);

	    Template template = JForumExecutionContext.templateConfig()
		    .getTemplate("exception.html");
	    template.process(templateContext, w);
	} catch (Exception e) {
	    strWriter = new StringWriter();
	    writer = new PrintWriter(strWriter);
	    e.printStackTrace(writer);
	    writer.close();
	    logger.error(strWriter);
	}
    }

    private String extractCurrentUrl(RequestContext request) {
	return request == null ? "" : new StringBuffer().append("\nURL is: ")
		.append(request.getRequestURI()).append('?')
		.append(request.getQueryString()).toString();
    }
}
